AD 1866

Millennium:	2nd millennium
Centuries:	18th century 19th century 20th century
Decades:	1840s 1850s 1860s 1870s 1880s
Years:	1863 1864 1865 1866 1867 1868 1869

1866 in various calendars

Gregorian calendar	1866 MDCCCLXVI
Ab urbe condita	2619
Armenian calendar	1315 ԹՎ ՌՅԺԵ
Assyrian calendar	6616
Bahá'í calendar	22–23
Balinese saka calendar	1787–1788
Bengali calendar	1273
Berber calendar	2816
British Regnal year	29 Vict. 1 – 30 Vict. 1
Buddhist calendar	2410
Burmese calendar	1228
Byzantine calendar	7374–7375
Chinese calendar	乙丑年 (Wood Ox) 4562 or 4502     — to — 丙寅年 (Fire Tiger) 4563 or 4503
Coptic calendar	1582–1583
Discordian calendar	3032
Ethiopian calendar	1858–1859
Hebrew calendar	5626–5627
Hindu calendars
- Vikram Samvat	1922–1923
- Shaka Samvat	1787–1788
- Kali Yuga	4966–4967
Holocene calendar	11866
Igbo calendar	866–867
Iranian calendar	1244–1245
Islamic calendar	1282–1283
Japanese calendar	Keiō 2 (慶応２年)
Javanese calendar	1794–1795
Julian calendar	Gregorian minus 12 days
Korean calendar	4199
Minguo calendar	46 before ROC 民前46年
Nanakshahi calendar	398
Thai solar calendar	2408–2409
Tibetan calendar	阴木牛年 (female Wood-Ox) 1992 or 1611 or 839     — to — 阳火虎年 (male Fire-Tiger) 1993 or 1612 or 840
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1866 was a common year starting on Monday of the Gregorian calendar and a common year starting on Saturday of the Julian calendar, the 1866th year of the Common Era (CE) and Anno Domini (AD) designations, the 866th year of the 2nd millennium, the 66th year of the 19th century, and the 7th year of the 1860s decade. As of the start of 1866, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.

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